CodeIgniter 表单验证：正确处理数组型 POST 数据字段

// 原始的 set_rules 调用
$this->form_validation->set_rules('years[intStartYr]', 'Start Year', 'required',
    array('required' => 'Start year must have a valid year.'));
$this->form_validation->set_rules('years[intEndYr]', 'End Year', 'required',
    array('required' => 'End year must have a valid year.'));

// 修正后的 set_rules 调用
// 假设实际接收到的 POST 参数键名是 years['intStartYr']
$this->form_validation->set_rules("years['intStartYr']", 'Start Year', 'required',
    array('required' => 'Start year must have a valid year.'));
$this->form_validation->set_rules("years['intEndYr']", 'End Year', 'required',
    array('required' => 'End year must have a valid year.'));

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Manage extends CI_Controller {

    public function __construct() {
        parent::__construct();
        // 载入表单验证库
        $this->load->library('form_validation');
        // 载入输入库（通常已自动载入）
        $this->load->library('input');
        // 载入模型
        $this->load->model('climate_indicators_model');
    }

    /**
     * 更新研究年份信息
     * 接收 AJAX POST 请求
     */
    public function updateStudyYears() {
        // 1. 安全检查：确保是 POST 请求且是 AJAX 请求
        if (!$this->input->post() || !$this->input->is_ajax_request()) {
            echo json_encode(array('status' => 'failed', 'errors' => array('Access Mode' => 'Disallowed')));
            exit();
        }

        // 2. 获取并过滤 POST 数据
        // NULL, true 表示获取所有 POST 数据并进行 XSS 过滤
        $postData = $this->input->post(NULL, true);

        // 调试：打印接收到的 POST 数据，用于确认字段名
        // log_message('debug', 'Received POST data for updateStudyYears: ' . print_r($_POST, true));

        // 3. 检查 'years' 数组是否存在
        if (!isset($postData['years']) || !is_array($postData['years']) || empty($postData['years'])) {
            echo json_encode(array('status' => 'failed', 'errors' => 'Years data is empty or invalid.'));
            exit();
        }

        // 4. 设置表单验证规则
        // 根据实际的 POST 参数名称来设置规则
        // 假设通过调试确认，正确的字段名是 'years[intStartYr]' 和 'years[intEndYr]'
        // 如果调试发现是 'years[\'intStartYr\']'，则相应修改
        $this->form_validation->set_rules(
            'years[intStartYr]', // 字段名
            'Start Year',       // 字段标签
            'required|numeric', // 验证规则，添加 numeric 确保是数字
            array('required' => 'Start year must have a valid year.',
                  'numeric'  => 'Start year must be a number.')
        );
        $this->form_validation->set_rules(
            'years[intEndYr]',
            'End Year',
            'required|numeric', // 同样添加 numeric 验证
            array('required' => 'End year must have a valid year.',
                  'numeric'  => 'End year must be a number.')
        );

        // 5. 运行表单验证
        if ($this->form_validation->run() === FALSE) {
            // 验证失败，返回错误信息
            $validationErrs = $this->form_validation->error_array();
            echo json_encode(array('status' => 'form-errors', 'valErrs' => $validationErrs));
            exit();
        } else {
            // 验证成功，执行业务逻辑
            $yearArray = $postData['years'];
            $status = $this->climate_indicators_model->setStudyYears($yearArray);

            if ($status) {
                echo json_encode(array('status' => 'success', 'message' => 'Study year information successfully updated.'));
            } else {
                echo json_encode(array('status' => 'failed', 'errors' => 'Database error on update.'));
            }
            exit();
        }
    }
}